It's also because even if you know exactly what to do.. you do it in the estimated time, but then the customer asks for 3-4 changes afterwards.. so that doubles the time as well. Also bugs.
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yes it also equals out over many people
but always better to be pessimistic
It's also because even if you know exactly what to do.. you do it in the estimated time, but then the customer asks for 3-4 changes afterwards.. so that doubles the time as well. Also bugs.